According to MarketWatch The, it was announced that analyst firm UK Cambridge Analytica has access to a large number of Facebook users' personal data in order to use them for the development of psychological portraits of the US electorate. Against this background, Facebook shares have shown a significant decline.

So, Facebook shares have fallen in price by more than 7%, and more specifically to 7.81%. is the most powerful decline over the four-year period.

This fact interested in how US legislators and the UK and they have already started to investigate the fact of how the Cambridge Analytica was able to get access to confidential information (personal data of users of social networks). Data leak occurred it was during the election campaign of Donald Trump in 2016.

On the New York Times recently published an article, which dealt with the use of company Cambridge Analytica data of more than 50 million accounts from the social network. This figure is derived not from scratch - it confirmed in the course of investigative journalism former employees of companies that have been able to confirm this fact documented.

We also learned the purpose for which was the need to have access to user data - with their help were investigated and identified traits US voters in the future to be able to manipulate them.

Facebook Guide last week reported a Cambridge Analytica restricting access to the social network will be carried out until the investigation into the incident. It has become known that the social network employees have created firm Global Science Research, and she shared with Cambridge Analytica necessary information. And most interesting is that the users themselves have given the necessary information, as used by the application-questionnaire thisisyourdigitallife.

On the one hand there is nothing to complain about - the test passed netizens willingly, and gave approval for the further processing of the information provided in the application. That is the agreement on data privacy was not violated.

According to the data shown on the Cambridge Analytica website, the firm specializes in data analytics, including for political projects. So far, there is nothing illegal actions of the company, but it was an app that was a psychological portrait, but users are consciously shared personal information, though not fully understanding what purpose was carried out this testing.

Now thisisyourdigitallife application is not active, it is still blocked in 2016.

Now Mark Zuckerberg have much to explain, because in the test participated a total of 240 thousand. Man, while there was a leakage of data from social network profiles exceed the value of 50 million users.